ORACLE 10G创建表空间和创建用户
1、创建表空间
CREATE TABLESPACE mytablespace DATAFILE
'F:\oracle\product\10.2.0\oradata\myoracle\MYTABLESPACE01.DBF' SIZE 500M AUTOEXTEND ON NEXT
100M MAXSIZE UNLIMITED
LOGGING
PERMANENT
EXTENT MANAGEMENT LOCAL AUTOALLOCATE
BLOCKSIZE 8K
SEGMENT SPACE MANAGEMENT MANUAL
FLASHBACK ON;
2、创建用户
CREATE USER ECC_NOTE IDENTIFIED BY sys
PROFILE DEFAULT
DEFAULT TABLESPACE mytablespace
TEMPORARY TABLESPACE temp
ACCOUNT UNLOCK;
GRANT UNDER ANY TABLE TO ECC_NOTE WITH ADMIN OPTION;
GRANT UNDER ANY TYPE TO ECC_NOTE WITH ADMIN OPTION;
GRANT UNDER ANY VIEW TO ECC_NOTE WITH ADMIN OPTION;
GRANT "DBA" TO ECC_NOTE WITH ADMIN OPTION;
GRANT "OLAP_DBA" TO ECC_NOTE WITH ADMIN OPTION;
GRANT "OLAP_USER" TO ECC_NOTE WITH ADMIN OPTION;
GRANT "SELECT_CATALOG_ROLE" TO ECC_NOTE WITH ADMIN OPTION;
ALTER USER ECC_NOTE DEFAULT ROLE "DBA", "OLAP_DBA", "OLAP_USER", "SELECT_CATALOG_ROLE";
ALTER USER test QUOTA UNLIMITED ON ECC_NOTE;
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1.oralce删除命令
1.1.删除用户
drop user username cascade;
1.2.删除表空间
DROP TABLESPACE dataspace INCLUDING CONTENTS AND DATAFILES;
2.创建表空间
2.1.建立表空间
CREATE TABLESPACE dataspace
DATAFILE '/目录/dataspace.dbf' SIZE 500M
UNIFORM SIZE 128k; //指定区尺寸为128k,如不指定，区尺寸默认� ......
一.物理读(physical read)
当数据块第一次读取到,就会缓存到buffer cache 中,而第二次读取和修改该数据块时就在内存buffer cache 了 以下是例子:
1.1 第一次读取:
C:"Documents and Settings"Paul Yi>sqlplus "/as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Thu Feb 28 09:32:04 2008
Copyright (c) 19 ......
ORACLE 时间字段排序问题
早上在弄EXT排序的时候，因为数据库ID是STRING的，因此在command类里多了一个integer idSort字段，
没想到，根据这个整型的字段进行排序也不行，因为EXT分页出来的虽然是根据这个整型字段排序了。但是
各个页面没有完全的统一排序。
因此，在DAO里写了如下HQL语句：
select tbl from Tr ......
源贴地址:http://topic.csdn.net/u/20090520/15/08a03d2e-a537-4c06-b79a-7e2f7ed5f898.html
1,
ASCII
返回与指定的字符对应的十进制数;
SQL> select ascii(A) A,ascii(a) a,ascii(0) zero,ascii( ) space from dual;
A A ZERO SPACE
--------- --------- --------- ---------
65 97 48 32
2. CHR
......
//向数据库中写入
private void button1_Click(object sender, EventArgs e)
{
oracleConnection1.Open();
& ......
